<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <input type="text" id="ceshi">
    <script>
        var ceshi = document.querySelector('#ceshi')
        var timer = null;
        ceshi.oninput = function () {
            clearTimeout(timer)
            timer = setTimeout(()=> {
                if (this.value == '黑马程序员') {
                    console.log('验证通过')
                } else {
                    console.log('验证失败')
                }
            },1000)
        }
    </script>
</body>

</html>